@Francois, Andy (aka rhuk) is making lots of changes to 1.7 and seems to go 2 steps foreward and 1 step backward…
Unfortunately, most issues are not being logged on the Grav repo, but reported on Discord. Hence, it’s hard to find if your issue is a known issue.
Your issue seems to be a Grav core (or its libraries) related, which should be reported at the Grav repo. Andy doesn’t visit this forum, but lives on Discord and Github.