Impacted versions:
At least version 10, version 11(Can only re-produce the problem sometimes)

Steps to reproduce:
Please see this screencast recorded on odoo runbot.
https://youtu.be/cSPQvp9jQJc

Current behavior:
When users search by account in Journal Entries List View. A special value "dummy_account_id" is set in context, in order to facilitate search by account on account.move level.
With this context value , when users create a journal entries, the system will add default value before the creation.

https://github.com/odoo/odoo/blob/fc69b37cf710623ea215cd085e998679d8c50985/odoo/models.py#L3802

This method will set "dummy_account_id" to the previously searched account in vals.

Then the system continue creating account.move and related account.move.line records.
It is fine until the system run this:
https://github.com/odoo/odoo/blob/fc69b37cf710623ea215cd085e998679d8c50985/odoo/models.py#L3830

Since "dummy_account_id" is related field, and it now has value. The system will change the first related  account.move.line record to dummy_account_id.

Eventualy, the account is wrongly set to "dummy_account_id".

Expected behavior:
This is a feature which will fill the form field value with searched value for users. But the journal entry creation should not be affected by dummy_account_id, since it is only for searching purpose.

@Yenthe666 Would you please review this issue and help to bring related odoo staff to this issue?
addons/account/models/account_move.py
""" Returns the domain which is common to both manual and bank statement reconciliation.
            :param excluded_ids: list of ids of move lines that should not be fetched
            :param str: search string
        """
        context = (self._context or {})
        if excluded_ids is None:
            excluded_ids = []
        domain = []
        if excluded_ids:
            domain = expression.AND([domain, [('id', 'not in', excluded_ids)]])
        if str:
            str_domain = [
                '|', ('move_id.name', 'ilike', str),
                '|', ('move_id.ref', 'ilike', str),
                '|', ('date_maturity', 'like', str),
                '&', ('name', '!=', '/'), ('name', 'ilike', str)
            ]
            try:
                amount = float(str)
                amount_domain = [
                    '|', ('amount_residual', '=', amount),
                    '|', ('amount_residual_currency', '=', amount),
                    '|', ('amount_residual', '=', -amount),
                    '|', ('amount_residual_currency', '=', -amount),
                    '&', ('account_id.internal_type', '=', 'liquidity'),
                    '|', '|', ('debit', '=', amount), ('credit', '=', amount), ('amount_currency', '=', amount),