Descriptive Problem Summary:
When running a game with "map_format=SIDE_MAP" in the web client, all non-screen object displays appear to be shifted 1 tiles worth up.

This leaves a [world.icon_size] of black empty space at the bottom of the screen, and anything positioned at the north edge of your screen gets cut off by the edge of the display.

Screen objects however are positioned correctly.

This only happens in the web client.

Numbered Steps to Reproduce Problem:
1: Open a project with world.map_format=SIDE_MAP.
2: Notice a line of empty space at the bottom of your display.
3: Notice that your display is cut off at the top.

Does the problem occur:
Every time? Or how often?
Always.
In other games?
Any game with SIDE_MAP format.
In other user accounts?
Always.
On other computers?
Always.

When does the problem NOT occur?
When you DON'T have map_format=SIDE_MAP

Workarounds:
Don't use SIDE_MAP format.