Corrupted custom properties in DGN files

Good day all,

I've encountered an issue with certain DGN files. We use custom properties to store data related to the jobs in our DGN files, this data is used by some VBA routines that we use in our office. In some rare cases, these properties seem to get corrupted, and once that happens, I am unable to fix them. If I right click on the DGN in file explorer and switch to the Custom tab, it will crash file explorer, as well. It seems to happen only to DGN files that contain elements imported from outside files, but there isn't any apparent pattern to the sourcing of this external data: I've got one on my desk now that has had a DWG file referenced in and merged into the master, but it's also happened to files with DGN files and Esri Shapefiles attached (without being merged in).

Is anyone familiar with this issue?

In the cases where this happens, all work on the files grinds to a halt as a result of this issue. Any help would be appreciated.

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