Auto-night mode doesn't switch back to light theme
Auto-night mode does not work as intended when set to either system default, or adaptive, or schduled by time, or scheduled by sunrise/sunset time. In both cases Telegram switch to dark mode, following…
As it's not marketed, it seems like you can simply import your history and combine both whatsapp & telegram chats in 1 (in order to delete your whatsapp)
at least provide users more information how the import works or what the result looks like
“Messages will be imported into the current day but will also include their original timestamps. All members of the chat on Telegram will see the messages.” from https://telegram.org/blog/move-history