Will erasing iphone disconnect it from esim?

I haven’t had a chance to look if the phone had the network on esim when my passcode kept not working but after erasing it esim network was gone - had no option to choose to keep it. My phone had literally no storage, would that cause passcode to not work. I couldn’t open certain apps like Gmail one day before. So I had to delete some photos to be able to access Gmail again.

I’m not 100% sure if passcode didn’t work at the same time as esim network but I vaguely remember that I had a few text messages coming in which I didn’t care to look too carefully as I was concerned about passcode not working. After erasing the phone the esim wasn’t there for sure which I had to go into telco shop to get it fixed as the service was unavailable after resetting it. It worked immediately when the guy put a physical sim in it with my number - calls and text messages. No suspicious activities on my telco account, bank accounts etc. 

I initially thought it was some sort of hacking, maybe not sim swap or porting but now I’m wondering if lack of storage could cause passcode to not work at all sometimes and esim being erased by hard reset on the lock screen. Thanks for the advice.