Catch an error that is reported, but silently ignored during CI testing #6069

Job	Run time
Check towncrier / Towncrier Checks	40s
Pre-commit checks / Pre-commit Checks	39s
Package Toga (android) / Create Python Package	24s
Package Toga (cocoa) / Create Python Package	25s
Package Toga (core) / Create Python Package	20s
Package Toga (demo) / Create Python Package	17s
Package Toga (dummy) / Create Python Package	19s
Package Toga (gtk) / Create Python Package	17s
Package Toga (iOS) / Create Python Package	23s
Package Toga (textual) / Create Python Package	16s
Package Toga (toga) / Create Python Package	22s
Package Toga (web) / Create Python Package	20s
Package Toga (winforms) / Create Python Package	23s
Test core (macos-12, 3.8)	1m 32s
Test core (macos-12, 3.12)	1m 19s
Test core (macos-12, 3.13-dev)	1m 34s
Test core (macos-14, 3.12)	52s
Test core (macos-14, 3.13-dev)	41s
Test core (ubuntu-latest, 3.8)	57s
Test core (ubuntu-latest, 3.12)	1m 10s
Test core (ubuntu-latest, 3.13-dev)	33s
Test core (windows-latest, 3.8)	1m 58s
Test core (windows-latest, 3.12)	1m 41s
Test core (ubuntu-latest, 3.9, false)	59s
Test core (ubuntu-latest, 3.10, false)	59s
Test core (ubuntu-latest, 3.11, false)	58s
Testbed (macOS-x86_64)	3m 23s
Coverage	35s
Testbed (macOS-arm64)	2m 39s
Testbed (windows)	4m 46s
Testbed (linux)	2m 37s
Testbed (android)	8m 1s
Testbed (iOS)	8m 52s
	51m 11s

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