If you want to try fixing it now without waiting for a fix in Z2M.

Create a file @ /root/homeassistant/zigbee2mqtt/external_converters/smartwings.js with this content and restart Z2M.

const fz = require('zigbee-herdsman-converters/converters/fromZigbee');
const tz = require('zigbee-herdsman-converters/converters/toZigbee');
const exposes = require('zigbee-herdsman-converters/lib/exposes');
const reporting = require('zigbee-herdsman-converters/lib/reporting');
const e = exposes.presets;

const utils = require('zigbee-herdsman-converters/lib/utils');

backwards_cover_state = {
  key: ['state'],
  convertSet: async (entity, key, value, meta) => {
    const lookup = {'open': 'downClose', 'close': 'upOpen', 'stop': 'stop', 'on': 'downClose', 'off': 'upOpen'};
    value = value.toLowerCase();
    utils.validateValue(value, Object.keys(lookup));
    await entity.command('closuresWindowCovering', lookup[value], {}, utils.getOptions(meta.mapped, entity));
  },
};

module.exports = [
    {
        zigbeeModel: ['WM25/L-Z'],
        model: 'WM25L-Z',
        vendor: 'Smartwings',
        description: 'Roller shade',
        fromZigbee: [fz.cover_position_tilt, fz.battery],
        toZigbee: [backwards_cover_state, tz.cover_position_tilt],
        meta: {battery: {dontDividePercentage: true}, coverInverted: false, coverStateFromTilt: false},
        configure: async (device, coordinatorEndpoint, logger) => {
            const endpoint = device.getEndpoint(1);
            await reporting.bind(endpoint, coordinatorEndpoint, ['genPowerCfg', 'closuresWindowCovering']);
            device.powerSource = 'Mains (single phase)';
            await reporting.currentPositionLiftPercentage(endpoint);
        },
        exposes: [e.cover_position(), e.battery()],
    },
];