It's not a problem, it's a feature ...
Therefore you cannot solve it by rooting.
You can root the device and then install RepliGo Reader which allows annotations also in zoom mode. However, RepliGo has other drawbacks, like frequent flashes ...
A 6" device will never be a dedicated PDF reader. If you want a dedicated reader, e.g. the 10" Boox M92 might be a good choice. But it is 3 times as heavy and 3 times as expensive as the PRS-T1 ...
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