Fix BTInstance not registered with debugger on BTPlayer.set_bt_instan… #795

Job	Run time
🧪 Unit tests	2m 53s
cache-env	1s
⚙️ Static checks	9s
🐧 Linux / Editor (x86_64, release)	14m 37s
🍎 macOS / Editor (x86_64, release)	3m 28s
🪟 Windows / Editor (x86_64, release)	18m 1s
🔌 GDExtension / 🐧 Linux (x86_64, release)	23s
🍎 macOS / Editor (arm64, release)	2m 59s
🔌 GDExtension / 🐧 Linux (x86_64, debug)	27s
🔌 GDExtension / 🪟 Windows (x86_64, release)	3m 20s
🔌 GDExtension / 🪟 Windows (x86_64, debug)	3m 21s
🔌 GDExtension / 🍎 macOS (universal, release)	1m 0s
🔌 GDExtension / 🍎 macOS (universal, debug)	1m 14s
🐧 Linux / Template (x86_64, release)	9m 51s
🐧 Linux / Editor .NET (x86_64, release)	16m 40s
🔌 GDExtension / 📦 Package extension	28s
🍎 macOS / Make macOS Bundles (tmp-macos, false, true)	43s
🪟 Windows / .NET assembly for ${{ matrix.opts.arch }}	0s
	1h 19m 35s

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