Issue with Shm Size value (RouterOS 7.21.4)

After migrating to latest longterm 7.21.4 I had some issue with existing containers not starting properly.
After recreating them again, now they work, however when I open them (via winbox) to see all fields, there is this new item Shm Size which reports 64.0 MiB but in red, like having an error in the format.
This prevents me from applying any change to other parameters as that error won't make it able to save anything, unless resolved.

Does anyone have any idea which format that parameter requires so to fix it ?
Thanks

Editing container with the GUI is no longer possible with WinBox 3 (which is now legacy software according to MikroTik) and recent RouterOS. You'll need to use WinBox 4 or the command line.

or WebFig.

Or MikroTik Pro app
https://play.google.com/store/apps/details?id=com.mikrotik.android.tikapp

Thank you everyone for the suggestion.