Could you give me more information on how I can reproduce the problem? In my case, everything works as it should.

app.componennt.html

<button mdbBtn color="primary" (click)="openModal()">Open modal</button>

app.component.ts

import { Component } from '@angular/core';
import { ModalDynamicComponent } from './components/modal-dynamic/modal-dynamic.component';
import { MDBModalRef, MDBModalService } from 'ng-uikit-pro-standard';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {
  modalRef: MDBModalRef;
  modalOptions = {
    backdrop: true,
    keyboard: true,
    focus: true,
    show: false,
    ignoreBackdropClick: false,
    class: 'right',
    containerClass: 'modal-lg modal-full-height modal-right',
    animated: true,
  };

  constructor(private modalService: MDBModalService) {}

  openModal() {
    this.modalRef = this.modalService.show(ModalDynamicComponent, this.modalOptions);
  }
}

./components/modal-dynamic-component.html

<div role="document">
  <div class="modal-header">
    <button
      type="button"
      class="close pull-right"
      aria-label="Close"
      (click)="modalRef.hide()"
    >
      <span aria-hidden="true">×</span>
    </button>
    <h4 class="modal-title w-100" id="myModalLabel">Modal title</h4>
  </div>
  <div class="modal-body">
    <p>
      Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus
      ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur
      ac, vestibulum at eros.
    </p>
  </div>
  <div class="modal-footer">
    <button type="button" mdbBtn color="secondary" class="waves-light" aria-label="Close" (click)="modalRef.hide()" mdbWavesEffect>
      Close
    </button>
    <button type="button" mdbBtn color="primary" class="relative waves-light" mdbWavesEffect>
      Save!
    </button>
  </div>
</div>

./components/modal-dynamic-component.ts

import { Component, OnInit } from '@angular/core';
import { MDBModalRef } from 'ng-uikit-pro-standard';

@Component({
  selector: 'app-modal-dynamic',
  templateUrl: './modal-dynamic.component.html',
  styleUrls: ['./modal-dynamic.component.scss']
})
export class ModalDynamicComponent implements OnInit {
  constructor(public modalRef: MDBModalRef) {}

  ngOnInit() {}
}

And app.module.ts

import { MDBBootstrapModulesPro } from 'ng-uikit-pro-standard';

import { MDBSpinningPreloader } from 'ng-uikit-pro-standard';
import { ModalDynamicComponent } from './components/modal-dynamic/modal-dynamic.component';

import { NgModule } from '@angular/core';

...

imports: [
    ...
    MDBBootstrapModulesPro.forRoot(),
    ...
],
entryComponents: [ ModalDynamicComponent ]
providers: [
...
MDBSpinningPreloader,
...
]

Also, you can't pass role: 'document' property in your object. If you want to pass this property you should add data property and then in this object add your role.

Like in this example: https://mdbootstrap.com/docs/angular/modals/basic/#inject-data

Best, Konrad.