After upgrade to 1.83.0, rust-analyzer custom snippets not works as expect

Editors and IDEs
1

Hello, I'm using helix + rust-analyzer.
In 1.80.1, my ~/.config/helix/languages.toml is

[language-server.rust-analyzer.config.completion.snippets.custom.context]
postfix = "context"
body = "c!(${receiver})"
description = "Wrap the expression in a c!"
scope = "expr"

after upgrade to 1.83.0, previous config not working. And if I change the config file to:

[language-server.rust-analyzer.config.completion.snippets.custom.context]
postfix = "context"
body = "c!(${receiver})"
description = "Wrap the expression in a c!"
scope = "expr"

[language-server.rust-analyzer.config]
rust-analyzer = {a = {}}

My context snippets works.