ECS | "Number of titles" counts all shared instances which have same CNs in different tenants when "Held by" is applied on Central tenant

Overview: "Number of titles" counts all shared instances which have same call numbers in different tenants when only one member tenant is selected in "Held by" facet on Central tenant.
Issue is not reproduced on Member tenants.

Issue reproduces on both Sunflower and Ramsons (backported cn browse)

Steps to reproduce:

1. Create following test data (2 Shared instances with same call numbers on different member tenants):

2. Go to “Inventory” >> “Browse”

3. Select any “Call number” browse option (issue reproduces for all call number browse options)

4. Browse for created call number: “595.0994”
   Expected/Actual result: “2” is displayed in “Number of titles”

5. Select “Member 1” (or “Member 2”; but not both) in “Held by” facet

Expected result: “1” displays in “Number of titles” column for created call number, because only call numbers from selected member must be displayed.
Actual result: “2” displays in “Number of titles” column for created call number.

See attached screenshots:

Only one instance will be found if user clicks on created call number (because of applied “Held by” facet).

Test data created: