Filename expansion bug

[Janek Mi]

For some time in my scripts I was using something like this:

```shell
#!/usr/bin/env bash
shopt -s failglob
command="echo xyz\(\)"
$command
```

And it was working fine. But somewhere between bash version 4 and 5 I
realized it generates an error:
no match: xyz\(\)

with exit code equal 1.

If I understand correctly \( character should not trigger filename
expansion.
Any ideas?

Appendix:
```eval '$command'``` is causing the same issue whereas ```eval
"$command"``` works the same as bash 4 without filename expansion. Changing
the quotation mark character makes a huge difference.