Redis unable to parse input: Expected Whitespaces

Question

I am using AWS' Redis MemoryDB 7 Preview with Vector Search enabled. The following queries fail for me with a strange error:

# create an index
FT.CREATE idx ON JSON SCHEMA $.title AS title TEXT

# add a document
JSON.SET doc $ '{"title":"hello"}'

# search for the document
FT.SEARCH idx "@title:hello"

This fails with the following error:

(error) ERR Parse error at 0 Unexpected `@` Expected whitespaces

However FT.SEARCH idx * works fine. I have tried setting export TERM=dumb because I thought that the terminal is escaping some characters incorrectly.

The Redis Engine on the MemoryDB is 7.1, my redis-cli 7.2.3.