Looking through tinted glass, as well as tinted glass panes, will make specific player heads just not render through the glass, as if the player head was another piece of glass. this was tested on multiple heads, and only the original head seemed to be affected. said head belonged to Hackaholic5069. The bug only triggers when the player crosshairs are not highlighting a block.
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Unable to reproduce bug in the latest snapshot. appears to be fixed
@unknown, is this now fixed for you in 1.15-pe1?