Troyis Chess: Couldn't parse SWF

[n0samu]

Describe the bug

Link to SWF: https://www8.agame.com/mirror/flash/t/troyis_chess.swf

Loading the SWF file for Troyis Chess fails with this error:
ERROR run_frame: ruffle_core::avm1::runtime: Couldn't parse SWF: Error parsing AVM1 action ConstantPool: Not enough data for string
ERROR run_frame: ruffle_core::avm1::runtime: No more actions will be executed in this movie.

The game displays but is not interactive.

Note that the game also fails to load in the latest Adobe Flash Player. But it works in Flash Player 7, 8 and 9 from here: https://archive.org/details/MacromediaFlashProjectors.7z

Expected behavior

The game should load as it does in Flash Player 7, 8 and 9.

Affected platform

Desktop app

Operating system

Windows 10

Browser

No response

Additional information

JPEXS Flash Decompiler is unable to disassemble the code in this movie.

I found this from the logs in #9047

[Dinnerbone]

Even FFDEC can't read the scripts 🤔

[n0samu]

The log from #9047 shows a few other instances of this error, but all of those are immediately following an unknown opcode with a huge amount of bogus data, so I'm not sure if those are a different problem. They similarly fail to load in latest Flash Player, though. An example is Tiny Battle: https://www8.agame.com/mirror/flash/t/tiny_battle.swf

[Lord-McSweeney]

For future reference, the reason JPEXS cannot read the scripts was because the ConstantPool entries were invalid strings, which we now ignore.