@substring I have used the already upgraded image, so I can't tell you if it was running before (and this is the first beta release running on rpi3+).
I have not set anything on ES, it is the stock configuration.
The support archive I have submitted is already when the bug occurs.
But.. in fact, kodi AND ES are working and there are no resolution problems, if I starts from ES and then Kodi, all is working great.
The bug apears when I'm leaving Kodi and the system returns back to ES, here the screen is cropped.

@Substring but WTH, why all is working after rebooting ES.....

@substring I tell you a fresh report : https://file.ac/oJYDOq7Jgr4/ maybe it can help

@substring I'm using an Artlii (video projector) with prefered mode "mode 39: 1360x768 @ 60Hz 16:9, clock:85MHz progressive"/DMT but it also supports 1080p/CEA
I dont understand why it fails when returning from Kodi but not if I restart ES from command line or at first boot.
For the tests I am using the archive listed on top of the topic (the wetransfer one).

Maybe something to report:
On rpi3b+, on starts, all is ok, ES feets the whole screen.
Running Kodi from here is ok, all is working great here.
But returning from Kodi to ES crops the screen (all is working, but the resolution is a lot smaller and some parts on the corners are not displayed).
Rebooting ES fixes the bug...