copilot suggestions not displayed after "o" (open line) command

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Define a function header on a single line, e.g:

# Calculate the nth number in the Fibinacci sequence
def fibinacci(n: int) -> int:

1. With your cursor after the : and in input mode, press enter. The next line auto indents and copilot suggests ghost text for the entire implementation.

2. Instead of above, in normal mode, press 'o'. The next line auto indents (i.e. we get to the same state as above) but copilot does not suggest anything.

On up to date Arch Linux using current vscode 1.97.2 with vim 1.29.0; or current insiders 1.98.0-insider with vim 1.29.0 although this bug has been around for ages.