I am running Server 9.3.7 on Ubuntu 18.04 with a Jetson Nano (original) and LXDE. I connect to this with Client 9.3.7 from Windows 11 Pro (25H2).
When I open an lxterminal for command input, the client only echoes the characters I type every second keystroke! I can see on the server machine’s physical display that all the keystrokes are being received in a timely manner, it is just that the client does not show them except in pairs. That is, I type “p” on the client and “p” is shown, then I type “w” but the client does not show this (although the server has clearly received it), then I type “d” and suddenly the client shows “wd” (i.e. the new key plus the previously non-echoed key).
This was not a problem under version 8, but I can no longer find any old DEB package to revert my Linux server.