Lightningcss randomly drops a selector, breaking styling

[danieltroger]

Steps to reproduce:

1. Unzip selector-dropped-repro.zip
2. npm install
3. node index.js

Expected behavior:

This rule from the input css is preserved:

.depict.plp .filters .body .input-row > .left {
  align-items: center;
  display: flex;
}

Actual behavior:

Output code is:

.depict.plp .filters .search-in-filters .query::placeholder{color:#868689}@media not all and (hover:none){.depict.plp .filters .search-in-filters .query:hover{color:#0f0f0f}.depict.plp .filters .search-in-filters .query:hover~.search-icon path{fill:#0f0f0f}}.depict.plp .filters .search-in-filters .query:focus{color:#000;border:1px solid #0f0f0f;outline:none}.depict.plp .filters .search-in-filters .query:focus~svg path{fill:#000}.depict.plp .filters .search-in-filters .query:focus~button svg path{fill:#000}.depict.plp .filters .body .input-row{justify-content:space-between;align-items:center;padding-top:5px;padding-bottom:5px;display:flex}.depict.plp .filters .body .input-row .text{color:#333335;-webkit-line-clamp:1;font-weight:400;line-height:20px}.depict.plp .filters .body .input-row :checked~.text{color:#0f0f0f;font-weight:500}.depict.plp .filters .body .input-row .fake-checked~.text{color:#0f0f0f;font-weight:500}.depict.plp .filters .body .input-row.count-0 *+.text{color:#cbcbcc}.depict.plp .filters .body .count{color:#868689;font-weight:400}.depict.plp .filters .body .input-row:not(.count-0):hover .count{color:#000}

Which does not contain the string .left, meaning that selector has been dropped/wrongly minified.