Unexpected Error when trying to change font style of buttons

[joshuadyck]

Description

If trying to change the font style of a button, the page freezes, then display: The editor has encountered an unexpected error.

Step-by-step reproduction instructions

Head to /wp-admin/site-editor.php?p=%2Fstyles&section=%2Ftypography
Then click on buttons. Sometimes it crashes already, if not, try changing the font style.

Screenshots, screen recording, code snippet

Error code:

al@https://www.sgw-gi.de/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.1:10:82327
Pt@https://www.sgw-gi.de/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.1:10:48526
n/zt/<@https://www.sgw-gi.de/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.1:10:48385
s@https://www.sgw-gi.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b6318:9:2363
c@https://www.sgw-gi.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b6318:9:2389
Oe/i/o.subscribe/r<@https://www.sgw-gi.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b6318:2:18939
de/instantiate/<@https://www.sgw-gi.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b6318:2:17214
d/S/<@https://www.sgw-gi.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b6318:2:6992
S@https://www.sgw-gi.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b6318:2:6979
U/</</<@https://www.sgw-gi.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b6318:2:9571
f/</</<@https://www.sgw-gi.de/wp-includes/js/dist/redux-routine.min.js?ver=8bb92d45458b29590f53:9:750
P/</<@https://www.sgw-gi.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b6318:2:9147
x/</</<@https://www.sgw-gi.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b6318:2:9509
de/instantiate/v<@https://www.sgw-gi.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b6318:2:15060
3440/V/<@https://www.sgw-gi.de/wp-includes/js/dist/core-data.min.js?ver=15baadfe6e1374188072:2:12511
U/</</<@https://www.sgw-gi.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b6318:2:9566
f/</</<@https://www.sgw-gi.de/wp-includes/js/dist/redux-routine.min.js?ver=8bb92d45458b29590f53:9:750
P/</<@https://www.sgw-gi.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b6318:2:9147
x/</</<@https://www.sgw-gi.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b6318:2:9509
de/instantiate/p/<@https://www.sgw-gi.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b6318:2:14959
@https://www.sgw-gi.de/wp-includes/js/dist/editor.min.js?ver=2239c699a89c6b9bc64f:14:1459
us/<@https://www.sgw-gi.de/wp-includes/js/dist/block-editor.min.js?ver=6ab992f915da9674d250:21:136570
yg/M<@https://www.sgw-gi.de/wp-includes/js/dist/block-editor.min.js?ver=6ab992f915da9674d250:21:298920
yg/P<@https://www.sgw-gi.de/wp-includes/js/dist/block-editor.min.js?ver=6ab992f915da9674d250:21:299041
yg/<@https://www.sgw-gi.de/wp-includes/js/dist/block-editor.min.js?ver=6ab992f915da9674d250:21:299110
Ur@https://www.sgw-gi.de/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.1:10:73201
El@https://www.sgw-gi.de/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.1:10:92845
n/xl/<@https://www.sgw-gi.de/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.1:10:91620
xl@https://www.sgw-gi.de/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.1:10:91680
fl@https://www.sgw-gi.de/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.1:10:85511
Nn@https://www.sgw-gi.de/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.1:10:32442
n/ul/<@https://www.sgw-gi.de/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.1:10:82952

Environment info

Wordpress 6.9
Theme: Twenty Twenty-Five
Using Docker Container

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure

[t-hamano]

Thanks for the report. This issue has been fixed and will be released in 6.9.1.

#73955