table doesn't exist in engine after ALTER other tables with CONSTRAINTs

MariaDB [DBname]> select count(*) from transaction;

ERROR 1932 (42S02): Table 'DBname.transaction' doesn't exist in engine

MariaDB [DBname]> select count(*) from transaction;

ERROR 1932 (42S02): Table 'DBname.transaction' doesn't exist in engine

MariaDB [DBname]> set foreign_key_checks=0;

Query OK, 0 rows affected (0.00 sec)

MariaDB [DBname]> select count(*) from transaction;

+-----------+

| count(*)  |

+-----------+

| 244715434 |

+-----------+

1 row in set (2 min 0.19 sec)

MariaDB [DBname]> set foreign_key_checks=1;

Query OK, 0 rows affected (0.00 sec)

MariaDB [DBname]> select count(*) from transaction;

+-----------+

| count(*)  |

+-----------+

| 244715434 |

+-----------+

1 row in set (2 min 1.28 sec)

MariaDB [DBname]> Bye

[root@host ~]# mysql DBname

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Welcome to the MariaDB monitor.  Commands end with ; or \g.

Your MariaDB connection id is 151

Server version: 10.2.11-MariaDB-log MariaDB Server

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [DBname]> select count(*) from transaction;

+-----------+

| count(*)  |

+-----------+

| 244715435 |

+-----------+

1 row in set (1 min 59.65 sec)

MariaDB [DBname]>