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
'name': _('Currency exchange rate difference'),
                'debit': amount_diff > 0 and aml.amount_residual or 0.0,
                'credit': amount_diff < 0 and -aml.amount_residual or 0.0,
                'account_id': amount_diff > 0 and self.company_id.currency_exchange_journal_id.default_debit_account_id.id or self.company_id.currency_exchange_journal_id.default_credit_account_id.id,
                'move_id': move.id,
                'currency_id': currency.id,
                'amount_currency': aml.amount_residual_currency,
                'partner_id': self.debit_move_id.partner_id.id})
            partial_rec = super(AccountPartialReconcile, partial_reconciles).create({
                    'debit_move_id': aml.credit and account_payable_line.id or aml.id,
                    'credit_move_id': aml.debit and account_payable_line.id or aml.id,
                    'amount': abs(aml.amount_residual),
                    'amount_currency': abs(aml.amount_residual_currency),
                    'currency_id': currency.id,
            })
            move_lines |= account_payable_line
            partial_reconciles |= partial_rec
        partial_reconciles._compute_partial_lines()
        return move_lines, partial_reconciles
    # Do 
    def _compute_partial_lines(self):
        if self._context.get('skip_full_reconcile_check'):
            #whe
            #rec
            return self
        #che
        #fir
        partial_rec_set = OrderedDict.fromkeys([x for x in self])
        aml_set = aml_to_balance = self.env['account.move.line']
        total_debit = 0