3 solo flawless attempts and this bug has stopped me every time. For some reason. Even with a vestige + deepsight there is no option to deposit.
It seems that the first indicator that this is going to happen is that, when setting up the initial triangle, the beams don’t form. You can see where to deposit though because of the green orbs.
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Also have lost 3 solo flawless to this already. The first two, the beams didn't appear in the setup phase and then couldn't deposit the vestige. The third time, one of the locations glitched between showing the symbol needed and the looking glass thing, both were active at the same time on that one spot and I wasn't able to do anything with it.