Virtualize breaks bootstrap 5.1 grid

Hello,

Using this code:

```

On Bootstrap 4.3 the columns appear next to each other including the element to add users, something like this:

Add User | Col 1 | Col 2 | Col 3
Col 4 | Col 5 | Col 6 | ...

On bootstrap 5.1 included in net core 6, the first column has a break after it and the rest of the columns appear next to each other, something like this:

Add User
| Col 1 | Col 2 | Col 3 | Col 4
| Col 5 | Col 6 | ...

I found that the culprit is the following div inserted by virtualize before the first element of the list:

`

This line appears in both netcore 5 and netcore 6, but since netcore 5 uses bootstrap 4.3 it doesn't breaks. Is there a solution or should I use bootstrap 4.3 instead of 5.1 with netcore 6?

Best regards