Hi Abates - welcome to the forums,
I’ve responded to each of your items below…
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Bats falling through the ground. This is an issue the team are aware of and asre working on. It appears to affect a number of items and may be one of the potential triggers for the interaction issue.
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Full inventory noise. This is another issue the team is aware of and will be working to resolve. I understand this too can be a very annoying issue when moving around your island with a full inventory.
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Bug report tab. I shall pass this suggestion onto the team and I appreciate you taking the time to visit our forums to report these issues.
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Deleting a save. It sounds like this save was affected by the interaction issue. While we do not have a set timeline for a fix, one of the Dev team working on the fix has said that the fix for this issue should retro-actively fix saves that are already affected. While I understand it is too late for this save, if you have others affected I would recommend holding onto them for now.
More information and the latest updates on the interaction issue can be found here: [Known Issue][PS4/XB1] Loss of interactions