Block Properties Table inaccessible

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Been having issues with this block for a few days now. Previously, the block inserted fine with no hiccups. Then it started inserting without the attribute at the bottom right that shows the manufacturer. Then it was inserting with the attribute. Then it would xref without the attribute, and upon binding would occasionally re-obtain the attribute with an attsync. Then it wouldn't allow me to open / access / edit the block properties table while in block editor. Now it sometimes allows me to access the block properties table in block editor when I open the block definition, but not every time and it requires an AutoCAD restart every attempt. Not really sure what could be causing this, but it'd be nice to have some insight so I can fix it if this issue ever comes up again. I've attached the block, and am currently using AutoCAD Architecture 2018. Let me know if you come up with anything.
Side note: I can't seem to delete the G-Anno-Ttlb Layer from the block definition. Please let me know if there is somthing that I'm missing with that for bonus points!