6/28 UPDATE: My phone was showing as 3% once it came to life this morning after the recovery mode boot up. This is weird because when my phone went dead on Friday I remember having roughly ~80% battery, maybe it drained over the weekend sitting idle. Not sure it means anything but I thought it was worth a note.
I got it charged up and input my SIM card in. I did a restart just to get a clean slate with the SIM in and all went well. I then did a shutdown so that I could boot up in recovery mode again and do a wipe of my partition cache because I remember a couple of years ago on my Pixel with having issues after going from one version of Android to another and I found there was a recommendation that after major updates that a partition cache wipe was a good idea to avoid issues. While trying to get into recovery mode again I accidentally just did a regular boot and the phone began it’s normal start up procedures. I got the teracube logo, the pattern unlock request, the teracube logo again then a black screen again with no response. Additionally the phone was plugged in while doing this boot so I got the red LED light again. I tried doing a normal power on again and it wouldn’t boot up. So I did a recovery mode start up and was able to get in like I did earlier this morning (note I did the partition cache wipe at this point) and this time the battery showed 90%. Maybe the wipe will do the trick to keep it from happening again. Anyways it appears this issue I am having is only occurring during boot. I don’t restart my phone often so probably something I can live with for now.
I will be keeping an extra eye on performance and anything weird, more to come.
6/29: UPDATE: Nothing else to report really. Everything seems to be working normally. I haven’t attempted a restart again, might try that today.
7/1 UPDATE: Had to do a restart today after unbearable connectivity on cell network. Same thing, end in a black screen only to be powered on in recovery mode. Absolutely 100% wild to me that no one else has commented. Anyone else having this issue? Teracube trying to reproduce? Something isn’t right with my phone.