Flex-table-card

Is there a known issue with the sorting of monetary values or am I misusing it?

If I leave the card alone (and let sort_by: state+ do its thing), It works. But if I click on the headers, I don’t get the right sorting:

The “Distance” column sorts properly. The last one (which displays the age of the information) doesn’t (even if I remove the prefix and show only numbers:

image

The sorting by price column doesn’t work either if I remove sort_by: state+

type: custom:flex-table-card
sort_by: state+
clickable: true
max_rows: 5
entities:
  include:
    - sensor.station_*SP98
columns:
  - data: entity_picture
    align: center
    name: ""
    modify: "'<img src=\"' + x + '\"style=\"height: 35px\">'"
  - data: fuel_type
    align: center
    name: ""
    icon: mdi:gas-station
  - data: address,city
    multi_delimiter: ", "
    align: left
    name: ""
  - icon: mdi:currency-eur
    data: state
    name: ""
    align: center
  - data: distance
    modify: x + " km"
    name: Distance
  - icon: mdi:calendar-clock
    name: ""
    data: days_since_last_update
    align: center
    prefix: J+
layout_options:
  grid_columns: full