When importing a chat from Whatsapp in a chat with fewer than 1000 Telegram messages (Telegram puts all of the imported messages in order), the date of all of the Telegram (non-imported) messages gets changed to the date and time of the import.
Steps to reproduce
It isn't really clear what you have to do to make it happen, since I was testing out the import feature, and till a point it was working really well, but then there was this issue.
Anyway, these are the steps I did to import:
In my file manager, I clicked on the share button of the file .txt of the exported WhatsApp chat.
Shared to Telegram (it recognizes that it's a WhatsApp chat and opens the page to select the Telegram chat to which import the messages)
Clicked on the Telegram chat I wanted to import the messages to.
It might be worth noting that I did this process multiple times, and deleted the imported messages for both myself and the other person before re-importing them again.
Device info
Telegram Android 8.8.5 (27219), POCO POCO X3 NFC, 11 R? (30)
Another thing is that now, whenever I import any WhatsApp message, the old Telegram ones get date reset
Admin Dog
Imported messages appear sorted by their original date if added to a Telegram chat that is not a supergroup and has fewer than 1000 messages.
So, if the target chat of the chat import is a group (and not a supergroup), even with less than 1000 exchanged messages, the messages are imported with the current time (17:58).
Moreover, in this case, messages have been imported into the current day time (17:58), but will also include their original timestamps.
Yes, but this problem occurs in a single one-to-one chat! And if you notice, there isn't the text "Imported" next to the timestamp. That is because the screenshot shows Telegram messages, which were already there before the import, but have now changed timestamps.
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So, if the target chat of the chat import is a group (and not a supergroup), even with less than 1000 exchanged messages, the messages are imported with the current time (17:58).
Moreover, in this case, messages have been imported into the current day time (17:58), but will also include their original timestamps.