For corporate actions name change no snaphot data today

Alpaca Market Data
1

corporate actions endpoint for two symbol name changes for 12/10

ESGA to ACLC

and

TCS to TCSG

used Snapshots for daily bar for 12/10

TCSG has no snapshot data

and ACLC has no daily bar

2

Hopefully this FAQ (the Latest endpoints part) answers your question.