Temporal AA artefacts

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Ah ok.

Here is the test footage with Temporal AA disabled.
The effect seems to have disappeared (along with the anti aliasing).
However, on the last wall in the video, the effect also occurs, even with TAA disabled.

https://youtu.be/vXQsE7rJyqw

So there seems another issue present, unrelated to TAA.

This is the texture/normal map of the last wall in the video…

EDIT: Just saw that Youtube garbled up the material screenshot.
So here it is in full beauty:

And the material where the effect also occurs with TAA disabled is surprisingly simple…
An instance of this: