Flaky test place_holosign: Cannot execute null.return air().

[github-actions]

Flaky tests were detected in this test run. This means that there was a failure that was cleared when the tests were simply restarted.
Failures:

place_holosign: [18:53:30] Runtime in code/modules/mob/living/living_say.dm,234: Cannot execute null.return air().
proc name: say (/mob/living/say)
src: the snake (/mob/living/basic/snake)
src.loc: the sheriff\'s boots (/obj/item/clothing/shoes/cowboy/sheriff)
call stack:
the snake (/mob/living/basic/snake): say("SssSSsssss...", null, /list (/list), 1, /datum/language/common (/datum/language/common), 0, "AI Controller", 0, 7, null, /list (/list))
/datum/ai_behavior/perform_spe... (/datum/ai_behavior/perform_speech): perform(0.8, /datum/ai_controller/basic_con... (/datum/ai_controller/basic_controller/snake), "sssSSsssss...", 'sound/creatures/snake_hissing2...')
/datum/ai_controller/basic_con... (/datum/ai_controller/basic_controller/snake): ProcessBehavior(0.8, /datum/ai_behavior/perform_spe... (/datum/ai_behavior/perform_speech))
/datum/ai_controller/basic_con... (/datum/ai_controller/basic_controller/snake): process(0.1)
AI Behavior Ticker (/datum/controller/subsystem/processing/ai_behaviors): fire(0)
AI Behavior Ticker (/datum/controller/subsystem/processing/ai_behaviors): fire(0)
AI Behavior Ticker (/datum/controller/subsystem/processing/ai_behaviors): ignite(0)
Master (/datum/controller/master): RunQueue()
Master (/datum/controller/master): Loop(4)
Master (/datum/controller/master): StartProcessing(0) at code/modules/mob/living/living_say.dm:234