Deus Ex - Human Revolution (GOG) not running anymore from one day to the next

So I've been playing Deus Ex - Human Revolution Director's Cut (GOG version) on Linux just fine yesterday, and today it just won't start with the following error in the log:

(16:31:59) [ERROR]:   An exception occurred when launching the game:
(16:31:59) [ERROR]:   TypeError: Use `delete()` to clear values
    at ElectronStore.set (/tmp/.mount_Heroicmqk0pP/resources/app.asar/node_modules/conf/dist/source/index.js:165:19)
    at Ae.set (/tmp/.mount_Heroicmqk0pP/resources/app.asar/build/main/main.js:7:10790)
    at Ls (/tmp/.mount_Heroicmqk0pP/resources/app.asar/build/main/main.js:12:5431)
    at processTicksAndRejections (node:internal/process/task_queues:105:5)
    at Module.Qc [as launch] (/tmp/.mount_Heroicmqk0pP/resources/app.asar/build/main/main.js:16:5874)
    at No (/tmp/.mount_Heroicmqk0pP/resources/app.asar/build/main/main.js:128:1469)
    at Session.<anonymous> (node:electron/js2c/browser_init:2:106823)
============= End of log =============

This is on Heroic 2.18.1. There were no changes between now and the last time it worked, no system updates, no Heroic or game update. I rebooted my PC, tried Verify & Repair, but no luck.

I am on Linux Mint 22.1.

What is happening, and what can I do about it?
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