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I have found that the latest version of Premiere Pro freezes most of the time when entering Markers on the Timeline.
I am using High Sierra version of Mac OS and can't upgrade this as I use legacy software that won't work with the later systems.
I noticed that a lot of Adobe product upgrades have stopped working with High Sierra but Premiere Pro allowed me to upgrade.
When I go back to the ealier versions of Premiere Pro 2020 the marker function works properly with no freezes.
Please try these rebooting steps:
FAQ: How to reset (trash) preferences.
FAQ: Clearing Cache Method Premiere Pro v14 « DAV's TechTableand if it doesn't work please povide us with your system and pc/laptop specs