Message box is out of reach if private conversation list is too long

[Farenheid]

Hello,
Here is a problem I have on three different instances of Moodle 4.0.6, using Snap 2022122100.
In the messaging page (mydomain/message/), if I open the private conversations list and if there are so many conversations that there is not enough space to display them all in the page (scroll bar shows up), then if I choose one of the conversations, I cannot scroll through the messages and the write box is out of reach.
I can easily make it reachable again just by closing the conversations list (click on Private).
Not really serious, but annoying.
Thanks,

J.