[Bug] Cover open_cover / set_cover_position raises RuntimeError code=2 (motor-control) but motor still executes

[eric2100]

Environment

• HA version: 2026.8.1
• Integration version: Xiaomi Home v0.4.7
• Device: 米家智能窗簾 (Mi Smart Curtain), model 090615.curtain.sidt82, 2 units

Symptom

Calling cover.open_cover or cover.set_cover_position on the curtain entities raises:

RuntimeError('执行错误, 未知错误, code=2, cover.090615_cn_510065454_sidt82_s_2_curtain, 窗帘, motor-control')

...but the curtain physically moves (the motor executes the command). cover.close_cover works without error.

Impact

Any automation/script that calls open/set_position aborts at that step (default continue_on_error: false), so all subsequent actions are skipped. Workaround: add continue_on_error: true to those actions.

Reproduction

1. Call cover.open_cover on the entity (service call / REST / python_script)
2. Exception is raised, but the curtain still opens
3. cover.close_cover returns OK

Expected behavior

No exception — the command succeeded physically. At minimum it should be a warning, not an error that aborts scripts.

Notes

• Both curtains affected (same model, different devices)
• code=2 with motor-control suggests the API returns an error even though the command was executed