Adding a new field to a collection removes an irrelevant relation field value for each item

Hello. I have collections Space and Snapshot. They both have a relation field like Snapshot has and belongs to many Spaces, and vice-versa. I had Snapshot items that were linked to Spaces, but when I added a new text field to the Snapshot table that is irrelevant to any relation, all my Snapshot items lost their relation to their respective Space item. Is there a reason for this, or is this a bug? Thanks.

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