Nextcloud Apline LXC - Left click = download issue instead of preview/showing

[IcHiAT]

Hi together,
maybe someone else facing the left click = download issue.
According to this:

How to fix it?
go to
nano /etc/nginx/mime.types

change the line from this
application/javascript js;

to this
application/javascript js mjs;

Is this something that should be automatically in the helper scripts to fix the issue?