After upgrade I now have an error something to do with buttons:
TypeError: undefined is not an object (evaluating 'datatables_net_bs5__WEBPACK_IMPORTED_MODULE_1__["default"].Buttons.defaults')
package.json:
"datatables.net": "^2.1.8",
"datatables.net-bs5": "^2.1.8",
"datatables.net-buttons": "^3.2.0",
"datatables.net-buttons-bs5": "^3.2.0",
"datatables.net-fixedcolumns": "^5.0.4",
"datatables.net-fixedcolumns-bs5": "^5.0.4",
"datatables.net-rowreorder": "^1.5.0",
"datatables.net-rowreorder-bs5": "^1.5.0",
I use webpack, so I import like so:
import '../../styles/datatables.css';
import 'datatables.net-bs5';
import 'datatables.net-buttons-bs5';
import 'datatables.net-fixedcolumns-bs5';
import 'datatables.net-buttons/js/buttons.html5';
when instantiating the datatable, I use
layout: {
topEnd: ['search', 'buttons'],
},
It seems that the datatable is not defined. I don't know enough to even ask the questions right 
Do you have any ideas? This worked before upgrading.