It seems to me that the following block:

table {
  table-layout: fixed;
  border-collapse: collapse;
  width: 100%;
  margin: 40px 0;
}

table, th, td {
  border: 1px dashed var(--accent);
  padding: 10px;
}

breaks code blocks that have the linenos options set. If I remove the two blocks from the theme,
the code block gets rendered as expected.