Is it possible the scribe wrote the thin label text in the images first and then stopped using this quill after the first word on You are not allowed to view links.
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If we look at Q13 bifolio-wise:
bifolio 79-80: thin labels on You are not allowed to view links.
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bifolio 78-81: thick labels on You are not allowed to view links.
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bifolio 77-82: thick labels on You are not allowed to view links.
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bifolio 76-83: thick labels on You are not allowed to view links.
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bifolio 75-84: first word on You are not allowed to view links.
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It appears all over the place, especially f82 with both thick and thin labels is weird. If we consider You are not allowed to view links.
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76-83 - start, thick
78-81 - thick
77-82 - transition to thin on f82r,v bottom
79-80- thin
75-84 - thin incl. thin first word of main text
The question is- - do the thick labels correlate to the main text in a way that we can say they were written simultaneously? If so, we can argue that the scribe stopped writing labels together with the main text on f82 r+v bottom for whatever reason and also chose to omit them on bifolios 79-80 and 75-84. Then added them later including the first word on f75r.
As always, things appear complicated and I would not rule out the VM was created in several passes.