I am having the same problem mentioned here (in archive):
/forum/archive/linkedin-url-sharing-not-working-t7241
I can't share pages on linkedin. I know it is not an Apache conf file issue, or an htaccess issue, or a bad code issue because I can create a static version of the page and it shares just fine.
Same issue with Wayback Machine: it won't index grav-controlled pages but will index static versions of these pages just fine.
I do not have caching or compression enabled.
Any ideas?