'Read thread' colour change not working.

[RustyBear]

Hiding some threads I'm not interested in on the Active Conversations list, I noticed that some threads I knew I hadn't opened were suddenly highlighted.
After some experimentation, it seems that the colour change is staying in the same place in the list when a thread is hidden instead of staying on the thread title. (see attached screenshots, where the highlighted title remains the 4th & 8th thread from the top)

I'm using Safari on a 2020 iPadPro running iPadOS 15.5 and with AdGuard installed, though the issue appears whether AdGuard is turned on or off.

Hello @RustyBear thanks for letting us know about this. I'm unable to recreate the issue on Safari. Can we ask you to please log out and then back in again and let us know if this is still happening? Thank you.

Yes, it's still happening after logging out & in again.

Thanks RustyBear - sorry to hear this is still happening; we're trying to replicate it so we can see what you see.

We know it's a faff so thanks for your patience.