whenever someone uses a spyglass with a crossbow in the offhand the animation is of a crossbow instead of the spyglass animation so it looks like the spyglass is just hovering at eye level. it also works in snapshot 20w48a but it wouldnt let me add that to the versions.
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This appears to be a duplicate of MC-203838, which hasn't yet been resolved. If you have any additional information to provide regarding this issue, feel free to comment on the parent ticket. If you feel that this issue is affecting you, feel free to vote for the duplicated ticket, to give Mojang a basic idea of how many people are impacted by the problem. Just to further inform you, this will not determine how quickly the bug gets handled or fixed.
Can confirm, would like to add that only a loaded crossbow triggered the glitch