@SuiteSuccessCarl, I had a similar issue years ago. I would often test the switch and measure the current, sometimes taking a few minutes in the process. One of the times I just couldn’t pull the plunger out. Got me curious why it stuck.
So I did a forensic exam of the switch. I found the plastic plunger, that separates the spring loaded contacts, had melted into the contacts. My conclusion was the contacts had previously made poor contact and became rather hot, probably glowing. When the plunger was reinserted to separate the contacts, the contacts also melted into the plastic plunger.
After that experience,I paid a bit more attention to switch current handling capacity, though that data can be a challenge to find. It was one more reason I changed to electric over hydraulic