I am using node-red-contrib-telegrambot to use it as an administrator bot in my groups. One important thing I have implemented 2 years ago is a captcha question to kick spammers. Since one or two months ago I am not be able to "get" the "new_chat_member" message in order to start the captch procedure.
I have done a lot of tests, the owner of node-red-contrib-telegrambot has implemented an special debug mode to get all "update" messages but ....these premium users .. I don't know. They behave different than normal users.
Spammers are not previous group members, they join my groups without triggering any "new member" message from Telegram server.
I have also seen these spammers in other groups (not mine) and same problems.
Is there any "premium users" in Telegram that overdrive the "new chat memeber" procedure?
Here you have some log (attached as image, here i can not attach text file): first three lines are for a normal user, and the last two are for a "premium user". As you can see, the last one joins the group without any problem (I have checked if it is a member after 30, 60, 180 and 600 seconds from the his first post).
Please help
Steps to reproduce
Some users are joining my groups WITHOUT triggering any new_chat_member message. I can not reproduce it by my self.
2026-03-30 13:42:57 {"type":"update","content":{"update_id":578352355,"message":{"message_id":74327,"from":{"id":1217414797,"is_bot":false,"first_name":"Clarissa","last_name":"Venturi","username":"ClarissaVen","is_premium":true},"chat":{"id":-10017657XXXXX,"title":"XXXXXXXXXXXXXXX","username":"xxxxxxx","type":"supergroup"},"date":1774878176,"text":"Only 2 positions open!\nFully remote — all you need is your phone\nNo office job, no PC required, flexible hours\nStart making €290+ per week right away\nOpen for ages 18–65, no prior experience needed\n\n📩 Interested?\nSend a “+” via private message → @ MateoG7"}}}
2026-03-30 13:42:57 {"chatId":-10017657XXXXX,"messageId":74327,"type":"message","content":"Only 2 positions open!\nFully remote — all you need is your phone\nNo office job, no PC required, flexible hours\nStart making €290+ per week right away\nOpen for ages 18–65, no prior experience needed\n\n📩 Interested?\nSend a “+” via private message → @ MateoG7","date":1774878176}
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2026-03-29 09:39:22 {"type":"update","content":{"update_id":578352267,"message":{"message_id":74245,"from":{"id":950602560,"is_bot":false,"first_name":"Jeanreno","username":"Jeanreno74"},"chat":{"id":-10017657XXXXX,"title":"XXXXXXXXXXXXXXX","username":"xxxxxxx","type":"supergroup"},"date":1774777162,"new_chat_participant":{"id":950602560,"is_bot":false,"first_name":"Jeanreno","username":"Jeanreno74"},"new_chat_member":{"id":950602560,"is_bot":false,"first_name":"Jeanreno","username":"Jeanreno74"},"new_chat_members":[{"id":950602560,"is_bot":false,"first_name":"Jeanreno","username":"Jeanreno74"}]}}}
2026-03-29 09:39:22 {"chatId":-10017657XXXXX,"messageId":74245,"type":"new_chat_members","content":[{"id":950602560,"is_bot":false,"first_name":"Jeanreno","username":"Jeanreno74"}],"user":{"id":950602560,"is_bot":false,"first_name":"Jeanreno","username":"Jeanreno74"},"date":1774777162}
2026-03-29 09:42:00 {"type":"update","content":{"update_id":578352268,"callback_query":{"id":"4082806909426091071","from":{"id":950602560,"is_bot":false,"first_name":"Jeanreno","username":"Jeanreno74","language_code":"es"},"message":{"message_id":74246,"from":{"id":6064063877,"is_bot":true,"first_name":"admin","username":"yyyyyyy"},"chat":{"id":-10017657XXXXX,"title":"XXXXXXXXXXXXXXX","username":"xxxxxxx","type":"supergroup"},"date":1774777162,"text":"@Jeanreno74 👋 Jeanreno\n\n QUESTION","entities":[{"offset":0,"length":11,"type":"mention"},{"offset":61,"length":11,"type":"bold"},{"offset":72,"length":26,"type":"bold"},{"offset":72,"length":2,"type":"underline"},{"offset":102,"length":16,"type":"bold"},{"offset":102,"length":16,"type":"italic"}],"reply_markup":{"inline_keyboard":[[{"text":"answer1","callback_data":"answer1"},{"text":"answer2","callback_data":"answer2"}],[{"text":"answer3","callback_data":"answer3"},{"text":"answer4","callback_data":"answer4"}]]}},"chat_instance":"4227658451551577041","data":"answer3"}}}
2026-03-30 13:42:57 {"type":"update","content":{"update_id":578352355,"message":{"message_id":74327,"from":{"id":1217414797,"is_bot":false,"first_name":"Clarissa","last_name":"Venturi","username":"ClarissaVen","is_premium":true},"chat":{"id":-10017657XXXXX,"title":"XXXXXXXXXXXXXXX","username":"xxxxxxx","type":"supergroup"},"date":1774878176,"text":"Only 2 positions open!\nFully remote — all you need is your phone\nNo office job, no PC required, flexible hours\nStart making €290+ per week right away\nOpen for ages 18–65, no prior experience needed\n\n📩 Interested?\nSend a “+” via private message → @ MateoG7"}}}
2026-03-30 13:42:57 {"chatId":-10017657XXXXX,"messageId":74327,"type":"message","content":"Only 2 positions open!\nFully remote — all you need is your phone\nNo office job, no PC required, flexible hours\nStart making €290+ per week right away\nOpen for ages 18–65, no prior experience needed\n\n📩 Interested?\nSend a “+” via private message → @ MateoG7","date":1774878176}