Reaper 5.31
Windows 10 x64
I use the M-shortcut ("Insert marker at current position") for tempo-mapping songs, and I always forget to zoom out so I can see the whole track. I place a marker on the first beat of every bar while the song is playing, but as soon as the edit cursor/playback line moves out of view, pressing M will place the marker where I first started playback.
How to reproduce:
This might be by design, to ensure that markers aren't accidentally placed without the user noticing. In that case, I'm posting this as a feature request/suggestion to change this behaviour.