Bundle Special Prices not correctly rounded

[Stassy]

When adding a Special Price to a bundle like 78,9473% (4 decimals), it's saved ok in the database.
If you load the same bundle and save again, it's changed to 78.95% (2 decimals)

Preconditions

1. Magento 2.2.5 (able to reproduce everytime)

Steps to reproduce

1. Create one product with price 760€
2. Create a bundle with this product
3. Set a special price to this bundle to 78.9473%
   (I want price of this bundle to be 600€. So 600€ / 760€ = 0,7894736842)
4. Save bundle only ONCE !!!!! (DO NOT RELOAD IT, DO NOT SAVE A SECOND TIME)
5. Check in DB : SELECT * FROM catalog_product_entity_decimal WHERE attribute_id = 78;
   value is 78.9473
6. Open bundle again and go to Advanced pricing --> Value is 78.95%
7. Don't touch anything and Save bundle
8. Check in DB : SELECT * FROM catalog_product_entity_decimal WHERE attribute_id = 78;
   value is 78.95
9. As a final result in the shop, bundle price is 600,01€

Expected result

1. In Step 6, expected value should be the one in database : 78,9473% (not rounded)

Actual result

1. In Step 6, value is rounded to 2 decimals at 78.95%

EXTRA INFO

Maybe a link with this issue from PierreLeMaguer : #15311

Thanks

[magento-engcom-team]

Hi @Stassy. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento-engcom-team give me {$VERSION} instance

where {$VERSION} is version tags (starting from 2.2.0+) or develop branches (2.2-develop +).
For more details, please, review the Magento Contributor Assistant documentation.

@Stassy do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[Stassy]

@magento-engcom-team give me 2.2.5 instance

[magento-engcom-team]

Hi @Stassy. Thank you for your request. I'm working on Magento 2.2.5 instance for you

[magento-engcom-team]

Hi @Stassy, here is your Magento instance.
Admin access: https://i-17638-2-2-5.engcom.dev.magento.com/admin
Login: admin Password: 123123q
Instance will be terminated in up to 3 hours.

[Stassy]

@magento-engcom-team I confirm I can reproduce it on Vanilla

@Stassy , thank you for your report.
We've acknowledged the issue and added to our backlog.