The subject is not always the performer of the action; it is sometimes the receiver of the action.
我的车修好了。
Wǒ de chē xiū hǎo le。
My car has been fi xed.
(车 does not perform the action of 修.)
[1] Yip, P. C., Rimmington, D., Xiaoming, Z., & Henson, R. (2009). Basic Chinese: a grammar and workbook. Taylor & Francis.
[2] Teng, W. H. (2016). Yufa! A practical guide to Mandarin Chinese grammar. Taylor & Francis.