Environment details (Put x in the checkbox along with the information)

• Operating System: Arch Linux
• Terminal Emulator: kitty
• Shell: bash
• Program options used: aAQSU
• nnn version: 4.5

Exact steps to reproduce the issue

export NNN_PLUG='c:-!|file "$nnn"'; nnn

Navigate to a file. Call plugin 'c'. Result is:
"$nnn": cannot open "$nnn"' (No such file or directory)`

Note: this happens regardless of the double quoting of $nnn.

Expected result

Observe file information being shown.