Rules for searching log files when attaching database files to SQL Server

Question proposal
Different phenomena occur when attaching a single database. Some environments can be attached successfully, while others cannot. After an attempt, the following rules are found.

Additional rules
Search for log files in the following order.
1. Search for the log file whose name matches the current folder where the database file is located. Name matching means that the log file is the database file name + _ log. LDF.
2. Search for the log files used when the database was last separated. If yes, the log file is used.
3. If neither 1 nor 2 is found, create a log file in the current folder with the database file.

In one attempt, because 2nd rules are met, the log file has been replaced with an unmatched log file. In this way, attaching operations that do not seem to have any problems will always fail.