`aa = keras::layer_input()` breaks the global environment viewer

[xinstein]

Describe the bug The title is clear enough.

To Reproduce Steps to reproduce the behavior:

1. command palette -> create r terminal
2. library(keras)
3. aa = layer_input(shape=c(2,3))
4. the assignment succeeds, but environment viewer will not update hereafter
5. every command hereafter will trigger a "Missing value where TRUE/FALSE needed" output in the R console.
6. Call rm(aa), everything goes back to normal.

Can you fix this issue by yourself? (We appreciate the help)

No

Environment (please complete the following information):

• OS: Windows 10 and ubuntu 22.04
• VSCode Version: Any will do
• R Version: anything above 4.1
• vscode-R version: 2.8.2